1. Workflow as suggested by takashi

2. Result of workflow as suggested by takashi
Aggregator and coercer do not reduce number of composite surfaces

3. Dissolving by rotating addition to takashi workflow
Extract bounds
Coerce to polygon
Rotate vertical to horizontal
Dissolve
Rotate back
Face replacer
Split surfaces per orientation
Split by vertical north-south, vertical east-west and horizontal and dissolve per plane and formation

4. Dissolving by rotating addition to takashi workflow
Dissolver removed lots of surface parts but also creates this strange surface representation

5. Dissolving by rotating addition to takashi workflow
Face replacer output vertical east-west planes

6. Dissolving by rotating addition to takashi workflow
Face replacer output vertical east-west planes and vertical north-south

7. Dissolving by rotating addition to takashi workflow
Face replacer output vertical east-west planes and vertical north-south and horizontal